Nut-lock.



D. A. CLARK, DEOD.

s. n. CLARK, ADMINISTBATRIX.

NUT LOGK. APPLICATION rum) AUG. 1. i010.

988,928. Patented Apr. 4,1911.

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THE NORRIS PETERS 6a., WASHINGTON. n. c.

UNITE ill" STATES PATENT DICE.

DAVID A. CLARK, DECEASED, LATE 0F ALTHEIMER, ARKANSAS; SARAH E. CLARK,ADMINISTRATRIX, ASSIGNOR OF ONE-HALF T0 IDA S. LANGFORD, OF PINE BLUFF,

ARKANSAS.

NUT-LOCK.

Specification of Letters Patent.

Application filed August 1, 1910.

Patented Apr. 4, 1911.

Serial No. 574,837.

To all whom it may concern:

Be it known that DAVID A. CLARK, late a citizen of the United States,formerly residing at Altheimer, in the county of Jefferson and State ofArkansas, did invent certain new and useful Improvements in Nut- Locks,of which the following is a specification, reference being had thereinto the accompanying drawing.

This invention relates to means for locking nuts and bolts together, andthe principal object of the same is to provide a simple and eflicientdevice by means of which a nut and bolt can be normally held in lockedrelation, means also being provided whereby the device'can be held in anunlocked position so that the nut and bolt can be readily separated.

In carrying out the objects of the invention generally stated above itwill be understood, of course, that the essential features thereof arenecessarily susceptible of Changes in details and structuralarrangements, one preferred and practical embodiment of which is shownin the accompanying drawings, wherein Figure 1 is a perspective view ofthe improved nut and bolt lock. Fig. 2 is an end view thereof. Fig. 3 isa detail perspective view of a spring forming a part of this invention.Fig. et is a similar view of a lug for attaching the spring to a nut.Fig. 5 is a similar view of a pawl and pivot bolt used in connectionwith this invention.

Referring to the accompanying drawings by numerals, 1 designates a boltthe threaded portion of which is provided with regularly spacedlongitudinally extending grooves 2. The nut 3 has its top provided witha detachable pivot bolt 4 which carries a pawl 5 for engagement with thegrooves 2 of the bolt 1 to prevent the nut being removed from the bolt.The pawl 5 is normally held in engagement with one of the grooves 2 ofthe bolt 1 to prevent reverse movement of the nut by means of a spring 6one end portion of which loosely surrounds a lug 7 and has a hook-shapedend 8 that enters recess 9 in said lug to prevent the spring slipping.The opposite end portion of the spring 6 is crimped to provide a lip 10that bears on the pawl 5 to hold said pawl engaged with the bolt 1, andsaid end portion is also bent to provide a socket 11 which receives thefree end of the pawl when disengaged from the bolt 1 to hold the sameunlocked, as shown by dotted lines in Fig. 2. The lug 7, as is shownmore clearly in Fig. l, is provided with a threaded shank 12 by means ofwhich the said lug is held in rigid but detachable engagement with thetop of the nut It will be seen from the fm'egoing that this inventionprovides simple means for holding the pawl engaged with the bolt ordisengaged therefrom, and also that the spring and the pawl aredetachably connected to the nut so that the same can be readily removedwhen necessary or desirable.

As is shown more clearly in Fig. 2 of the drawing, the end (3 of thespring which surrounds the lug 7, overlaps and bears upon thehook-shaped end 8 and is constantly exerting a pressure thereon so thatsaid end 8 is prevented from becoming accidentally displaced from recess9, and when the spring is forced away from bolt 1 to hold the pawl 5disengaged from said bolt, the said spring autonmtically tightens aboutlug 7 as is indicated by dotted lines in Fig. 2.

What is claimed as the invention is A nut lock comprising a boltprovided with grooves, a nut therefor, a pawl carried by said nut forengaging said grooves, a lug carried by said nut, and a spring fastenedto and coiled about said lug for normally holding the pawl in engagementwith the bolt said spring having its free end crimped to provide asocket for the reception of the free end of the pawl to hold said pawldisengaged from said bolt.

In testimony whereof I hereunto aflix my signature in presence of twowitnesses.

SARAH E. CLARK,

lildmi'nistmtre'm of the estate of David A.

Clark, deceased. Attest:

J. Canwronn, Ltroinnn JOHNSON.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. 0.

